Quadratic-equation definitions

The definition of a quadratic equation is one in which one of the terms is raised to the second power (squared).

An example of a quadratic equation is 2x² + 4x + 4.

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An equation that employs the variable x having the general form ax2 + bx + c = 0, where a, b, and c are constants and a does not equal zero; that is, the variable is squared but raised to no higher power.
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An equation in which the second power, or square, is the highest to which the unknown quantity is raised.
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(mathematics) A polynomial equation of the second degree.
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